Segment and Other Revenue Information (Revenue by Product) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenue from External Customer [Line Items]
Revenue	$ 1,254,000,000	$ 1,103,000,000	$ 1,114,000,000	$ 1,090,000,000	$ 1,176,000,000	$ 1,019,000,000	$ 1,094,000,000	$ 1,047,000,000	$ 4,561,000,000	[1]	$ 4,336,000,000	[1]	$ 4,233,000,000	[1],[2]
Anti-infectives
Revenue from External Customer [Line Items]
Revenue									1,295,000,000		1,268,000,000		1,311,000,000
Vaccines
Revenue from External Customer [Line Items]
Revenue									1,201,000,000		1,117,000,000		1,077,000,000
Parasiticides
Revenue from External Customer [Line Items]
Revenue									727,000,000		692,000,000		645,000,000
Medicated feed additives
Revenue from External Customer [Line Items]
Revenue									446,000,000		403,000,000		347,000,000
Other pharmaceuticals
Revenue from External Customer [Line Items]
Revenue									744,000,000		712,000,000		724,000,000
Other non-pharmaceuticals
Revenue from External Customer [Line Items]
Revenue									$ 148,000,000		$ 144,000,000		$ 129,000,000

[1] Revenue denominated in euros were $693 million in 2013, $639 million in 2012, and $710 million in 2011.

[2] Includes revenue and expenses from acquisitions from the acquisition date, see Note 3. Basis of Presentation and Note 5. Acquisitions, Divestitures and Certain Investments.